I am communicating with the TI CC3000 over SPI. With other NETMF devices, it works. But on the CerbuinoBee (firmware 18.104.22.168), it does not, returning nothing but 0x04’s. The first SPI message seems to be sent and accepted. But that is followed by an interrupt signal and an SPI Read which gets a response that is bad. The only difference I see in my logic analyzer is that MOSI is high leading up to the Read. On the other NET MF devices, on my Stellaris Launchpad, and according to TI docs, this is not normal.
Attached is the logic trace I captured from the CerbuinoBee (top) and the trace provided by Texas Instruments (bottom) with the offending signal marked with an arrow.
All this is very repeatable. It does this every time on the CerbuinoBee. What I don’t know is if this is “in spec” but the TI device is being picky or if this should be low, or perhaps there is a setting I missed.
Any experienced SPI folks with any thoughts?